/*
 * Copyright 2017-2025 noear.org and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.noear.solon.data.dynamicds;

import org.noear.solon.core.aspect.Invocation;
import org.noear.solon.core.aspect.MethodInterceptor;
import org.noear.solon.core.util.SnelUtil;

/**
 * 动态数据源切换
 *
 * @author noear
 * @since 1.11
 */
public class DynamicDsInterceptor implements MethodInterceptor {
    @Override
    public Object doIntercept(Invocation inv) throws Throwable {
        DynamicDs anno = inv.getMethodAnnotation(DynamicDs.class);

        if(anno == null){
            anno = inv.getTargetAnnotation(DynamicDs.class);
        }

        if (anno == null) {
            return inv.invoke();
        } else {
            //备份
            String backup = DynamicDsKey.current();

            try {
                String dsName = SnelUtil.evalTmpl(anno.value(), inv);

                DynamicDsKey.use(dsName);
                return inv.invoke();
            } finally {
                //还原
                DynamicDsKey.use(backup);
            }
        }
    }
}
